gulp.src does not work with unc server path

Copying some files are feeding them to gulp-zip from a connected network drive works when using the path with the drive-letter, but not with the unc server path. Trying to do so gives the following error:

[16:58:43] Error: File not found with singular glob: //server.domain.name/share/some/folders/manual.doc (if this was purposeful, use `allowEmpty` option)
    at Glob.<anonymous> (C:\sandbox\workdir\node_modules\glob-stream\readable.js:84:17)
    at Object.onceWrapper (events.js:277:13)
    at Glob.emit (events.js:189:13)
    at Glob.EventEmitter.emit (domain.js:441:20)
    at Glob._finish (C:\sandbox\workdir\node_modules\glob\glob.js:197:8)
    at done (C:\sandbox\workdir\node_modules\glob\glob.js:182:14)
    at Glob._processSimple2 (C:\sandbox\workdir\node_modules\glob\glob.js:688:12)
    at C:\sandbox\workdir\node_modules\glob\glob.js:676:10
    at Glob._stat2 (C:\sandbox\workdir\node_modules\glob\glob.js:772:12)
    at lstatcb_ (C:\sandbox\workdir\node_modules\glob\glob.js:764:12)
    at RES (C:\sandbox\workdir\node_modules\inflight\inflight.js:31:16)
    at f (C:\sandbox\workdir\node_modules\once\once.js:25:25)
    at FSReqWrap.oncomplete (fs.js:154:21)

What version of gulp are you using? 4.0.0 What versions of npm and node are you using?

$ node --version
v10.15.1

$ npm --version
6.8.0

All that on Windows 10.